Series for model B Ultra-fine high speed bunching machine1. Characteristics:With high rotation speed, with the main shaft counts the meters, the same machine twist the types of the same line, and the tolerance is only 0.0001%. With constant tension from empty bobbin to full bobbin, with superior quality for twist wire, it can realize bunching instead of twisting to match up FC-100 active back-twist pay-off machine. And meet requirements of customer to twist wire of small crossection area. The machine is driven by synchronization strap. Only need to change capstan wheel to change the pitch. Easy to operate.